- #1
Rasalhague
- 1,387
- 2
I'm trying to understand the meaning of the components of the stress(-energy) tensor. Considering just the space-space components, is this right?
[tex]T^{ij} = \frac{\mathrm{d} F^i}{\mathrm{d} A^j},[/tex]
where [itex]F^i[/itex] is the [itex]x^i[/tex]-component of force, [itex]i \neq 0[/itex], and [itex]\mathrm{d} A^j[/itex] is an area element perpendicular to the basis vector [itex]\textbf{e}_j, j \neq 0[/itex]. And does this mean that shear stress only exists in a non-Cartesian (non-Lorentzian) frame, i.e. that in a Cartesian (Lorentzian) frame, all elements off the main diagonal of a matrix representation of this tensor, in the space-space part, will be zero?
[tex]T^{ij} = \frac{\mathrm{d} F^i}{\mathrm{d} A^j},[/tex]
where [itex]F^i[/itex] is the [itex]x^i[/tex]-component of force, [itex]i \neq 0[/itex], and [itex]\mathrm{d} A^j[/itex] is an area element perpendicular to the basis vector [itex]\textbf{e}_j, j \neq 0[/itex]. And does this mean that shear stress only exists in a non-Cartesian (non-Lorentzian) frame, i.e. that in a Cartesian (Lorentzian) frame, all elements off the main diagonal of a matrix representation of this tensor, in the space-space part, will be zero?